5
Arzel® Zoning Technology
Preventive Maintenance Guide
(AirBoss™, 200 and 1200 Series Panels)
9) SOLENOID/PUMP OPERATION.
a) To verify proper pressure or vacuum to a damper, insert a tee in the tube
connected to that damper actuator and read with a Magnehelic or Digital gauge.
(Normal press/vac reading will be approximately 30 in. to 40 in. wc. (2 psi.).
b) To close a damper it must see a positive pressure of at least 25” wc.
i) An “Airflow Indicator” connected from the bottom of the Indicator to the
solenoid port should show pressure by lifting the ball to the top of the
Indicator (with the top port left open).
c) To open a damper it must see a vacuum of at least -25” wc.
i) An “Airflow Indicator” connected from the top of the Indicator to the
solenoid port should show vacuum by lifting the ball to the top of the
Indicator (with the bottom port left open).
10) AIR SIDE INTEGRITY CHECK
a) Use the Arzel “ Air Flow Indicator “ to determine if any damper actuators, tubing
or fittings are leaking air. Refer to instructions sent with the “Air Flow
Indicator”. If a zone shows air leakage, disconnect all but the first damper from
the air tube and continue adding dampers to the tube until the problem reappears.
b) To check damper actuators for leakage with out the Arzel “Air Flow Indicator”.
i) Disconnect tube from actuator and remove damper from duct
ii) Move damper blade to the closed position
iii) Hold finger over tube port.
iv) Move damper blade to the open position with finger still over port
v) The pressure build up in the actuator should impede the opening motion for as
long as you continue to push in the open direction.
vi) If the pressure subsides and the damper easily moves to the open position, the
actuator is leaking and the damper must be replaced.
vii) If the pressure holds, the damper is OK and the leak is in another damper or a
tube has come loose from a fitting.
11) LAT OPERATION
a) If furnace is cycling on internal limit or if LAT is cycling equipment off & on
unnecessarily, check the following:
i) Oversized bypass duct depleting return air and raising discharge air
temperature. (A bypass duct is used strictly to minimize excessive static
pressure and is a detriment to heat transfer across the heat exchanger)
ii) Set Heating “LAT” set point to maintain supply air temperatures within
furnace manufacturers specifications.
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